Jack and Jones are on a relay race. Jack runs at a speed of 12 km/h and Jones runs at 10 km/h. a) Write an algebraic expression to find the total distance covered by the two athletes if Jack runs for x hours and Jones runs for y hours.

the answer is 1030 it's very simple math.

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.